If you're looking for an alternative case for the LimeSDR, I recently bought this from Fry's (USA) and created spacers that you can 3D print if you have access. The spacers need to be drilled out, but work fine otherwise. As a matter of fact, the board is the exact width as the ribs of the case, so it fits very snugly. I printed mine out on a Makerbot Replicator. I intentionally left the backside just a hair longer...but it works beautifully. Imgur album with a few pictures and captions with some details are here... And the STL file for 3D printing and the 123D file are here for your pleasure. Enjoy.
I hope this small contribution helps someone in the community.